2. When the ventricles contract a
force is exerted against the
wall of arteries,
This causes a high pressure in
the arteries ,
This is called systolic pressure
3. Away from the aorta the pressure
falls gradually
And in the capillaries there is no
pressure
During systole 70ml of blood is
forced into the arteries
Normal systolic pressure
is120mm hg
4. When the heart relaxes,the
pressure within the arteries
diminishes.
This pressure is called
diastolic pressure
5. A person’s blood pressure is
expressed using the values of
both the systolic pressure and the
diastolic pressure.
The normal blood pressure is 80-
120mmHg
The apparatus used for measuring
blood pressure is called
sphygmomanometer.
6.
7. When the ventricles contract, the
blood in the right ventricle enters
the lungs through the pulmonary
arteries
From the lungs the oxygenated
blood flow back to the left atrium
This circulation is called
pulmonary circulation
8. When the ventricles contract,the blood
in the left ventricle flows to the
different parts of the body through
the aorta and its branches.
This blood come back to the heart and
enters the right right atrium through
the venacavae
This circulation is called systemic
circulation
9.
10. During one cardiac cycle,blood passes
through the heart two times,
So it is called double circulation
The pulmonary circulation and
systemic circulation are completely
separate.
